Digestive Tract. Development 3rd week 4th week The primordial gut forms during the 4th week as the...
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Digestive Tract
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Development3rd week 4th week
The primordial gut forms during the 4th weekas the folds incorporate the dorsal part of the yolk sac
into the embryo
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Development
Foregut Hindgut
Oropharyngeal membrane
Cloacal membrane
Foregut
Midgut
From oral cavity to duodenum (opening
of the bile duct)
Celiac trunk
Hindgut
From duodenum to transverse colon
Superior mesentericartery
Inferior mesentericartery The rest of colon
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Development
The endoderm of the primordial gut
Foregut Hindgut
Stomodeum Proctodeum
The ectoderm of the stomodeum
The epithelium and glands of the
digestive tract
The ectoderm of the proctodeum
The epithelium in the cranial part
The epithelium in the caudal part
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Wall
The wall is made up of four layers
1. Mucosa
2. Submucosa
3. Muscularis
4. Serosa / adventitia
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Mucosa
1. Mucosa
1. Epithelial lining
2. Lamina propria mucosaeConnective tissue
Blood vessels, lymphatics, macrophages and lymphocytes,
sometimes glands
3. Lamina muscularismucosaeSmooth muscles
Movements of the mucosa – bettercontact with food
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Submucosa
2. Submucosa Submucosal plexus(Meissner´s plexus) of
autonomic nervesFunction: secretion
Submucosal plexus
Connective tissueBlood and lymph vessels,
glands, lymphoidtissue
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MuscularisSmooth muscle cells2 sublayers
3. Muscularis
1) Internal - circular
2) External - longitudinal
Circular
Longitudinal
Myenteric plexus – (Auerbach´s plexus)contraction of the muscularis
Enteric nervous system: submucosal and myenteric plexus,
Plexus – aggregates of nerve cells that form parasympathetic ganglia (contains autonomic neurons)Origin: neural crest
Cajal´s cells- pacemaker
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Enteric nervous system
Romaňa´s sign
Chagas disease Hirschprung disease
Parasite injures the plexuses – dilatations: Megaesophagus,Megacolon
Kissing bug
Cells from neural crest don´t migrate well:Congenital megacolon
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Serosa / AdventitiaSerosaSimple squamous covering epithelium+Connective tissue rich in vessels and adipose tissue
Is continuous with themesenterium and the peritoneum
Organs which are insidethe abdominal cavity
4. Serosa / adventitia
Adventitia – connective tissueOrgans which are outside the abdominal cavity
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Parts of the digestive tract
oral cavity
pharynx
esophagus
stomach (ventriculus, gaster)
small intestine (intestinum tenue)
large intestine (intestinum crassum)
rectum
liver (hepar)
pancreas
gallbladder (vesica fellea)
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Lips (labia oris)labium superius
labium inferius
rima oris
anguli oris
sulcus nasolabialis
sulcus mentolabialis
philtrum
tuberculum labii superioris
transtion to the keratizing epithelium
pars cutanea, intermedia (sebaceous glands), mucosa (salivary glands - glandulae labiales)
m. orbicularis oris
http://www.botulinumtoxin-ambulanz.de/hemispasmus.htm
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Cheek (bucca)
m. buccinator covered by fascia buccopharyngea
corpus adiposum buccae (buccal fat pad) – reaches under ramus mandibulae into fossa infratemporalis
there are glandulae buccales in the mucosa
– small salivary glands
papilla parotidea
– at the level of the 2nd upper molar
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Cavitas oris(oral cavity)
rima oris (oral fissure) isthmus faucium (isthmus of fauces)
borders:
ventrally and externally: lips (labia oris) and cheeks (buccae)
roof: palate
floor: m. mylohyoideus and m. geniohyoideus
vestibulum oris (oral vestibule)
fornix vestibuli sup. + inf.
frenulum labii sup. + inf.
cavitas oris propria (oral cavity proper)
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Gum (gingiva)
mucosa covering the alveolar processes of the jaws, firmly grows together with periosteum
margo gingivalis
sulcus gingivalis
papillae gingivaleshttp://medical-dictionary.thefreedictionary.com/Gum+%28anatomy%29
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Teeth (dentes) Iarcus dentalis superior (elipsoid)arcus dentalis inferior (parabolic)
dentes permanentes (32) + dentes decidui (20)dens incisivus (cutter) 8/8 dens caninus (cuspid) 4/4dens premolaris (bicuspid) 8/0dens molaris (molar) 12/8teething (eruptio) dentes decidui 6th-30th month
dentes permanentes 6th-30th year
dental formula i1, i2, c, m1, m2 I1, I2, C, P1, P2, M1, M2, M3occlusion: psalidodontia – „scissors occlusion“
(labidodontia – „pincer occlusion“,…)
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Dental formula for deciduous teeth
Dental formula for permanent teeth
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Teeth(dentes) IIparts of the tooth corona dentis (crown) – cuspides cervix dentis (neck) radix dentis (root) – apex, canalis cavitas dentis – pulp (vessels, nerves)
gomphosis = dentoalveolar juncture
periodontium - ligaments between the alveolus and the tooth, run in many directions, hold the tooth in place
parodontium - all structures around the tooth (bone, connective tissue, gum)
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Periodontium
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facies (surfaces)
occlusalis
vestibularis x lingualis
directions
mesialis x distalis
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Oral cavityStratified squamous epithelium Non keratinized (Keratinized - gingiva, hard palate)
Lips – transition from the oral non-keratinizedepithelium to the keratinized skin
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Teeth
Crown
Neck
Root
Enamel
Cement
DentinPulp
cavity
Apical foramen
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DentinCalcified tissue harder than bone
70% calcium hydroxyapatite
Organic matrix: collagen I and glycosaminoglycans
Who makes the organic matrix?
Odontoblasts – tall cells that line the pulp cavity
Their long processes (Tomes processes)lie within dentinal tubules
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Enamel98% hydroxyapatite (fluorid incorporated by the crystals – fluorapatite is more resistent to acidic disolution caused by microorganism)
Organic matrix: no collagen, proteins: amelogenin, enamelin
Who makes the enamel?
Ameloblasts – one ameloblast produces one prism
After finishing the synthesis of enamel, ameloblasts cover the crown until the eruption of the tooth
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Tooth formation
6th week: thickening of the oral ectoderm = dental lamina
Dental lamina
Tooth bud
Tooth buds grow into the underlying mesenchyme
These tooth buds develop into the deciduous teeth
10 centers of proliferation
In one jaw
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Tooth formation1. Bud stage
Ectoderm
Mesenchyme
2. Cap stage
Enamel
Enamel organ
Dental papilla
Inner enamelepithelium
Outer enamelepithelium
Stellate reticulum
Enamel organ
3. Bell stage
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One layer of the mesenchymal cells in the dental papilla dfferentiates into odontoblasts
They produce dentin
Cells of the inner enamel epithelium differentiate into ameloblasts
They produce enamel –
the basal part of the cells produces it
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Cementum covers the dentin of the root. It is similar to bone, but has no osteons.
Dental sac
Dental sac
Cementum
Periodontal ligament
Periodontal ligament connects the cementum and the alveolar bone.
Collagen has an unusually high turnover
rate
Alveolar bone – primary (immature) bone
Gum – mucous membrane bound to the periosteum
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Tongue (lingua)muscle organ covered by mucosa
radix, corpus, apex
dorsum linguaesulcus medianus
sulcus terminalis
foramen caecum
papillae linguales (spits of the mucosa)
pp. filiformes
pp. fungiformes
pp. foliatae
pp. vallatae
tonsilla lingualis
margo linguae
facies inferiorfrenulum linguae (caruncula, plica sublingualis),
plica fimbriata
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Muscles of the tongue Iintraglossal muscles:
m. longitudinalis sup. + inf.
m. transversus linguae
m. verticalis linguae
aponeurosis linguae – on the dorsal surface
septum linguae – incomplete!
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Muscles of the tongue II
extraglossal muscles:m. genioglossus
m. hyoglossus
m. styloglossus
m. palatoglossus
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Supply of the tongue
arteries:a.car.ext-> a. lingualis
veins: v. lingualis -> v. jugularis int.
lymph drainage:n.l. submentales, submandibulares, cervicales
profundicontralateral connections!!!
innervation:motor: n. hypoglossus (XII), apart from
m.palatoglossus (X)sensitive: n. lingualis (V3), IX, Xsenzory: chorda tympani (VII), IX, X
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TongueMuscle covered by a mucous membrane (lamina propria penetrates the muscles)
NO submucosa
Muscle fibres cross one another in three planes
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TongueThe dorsal surface is covered by eminences calledpapillae
Filiform papillae
Numerous, rough surface
Fungiform papillae
Mushroom shaped
Foliate papillae
Poorly developed, parallelridges on the sides
(Circum)vallate papillae
The largest, 7-12, V-shapedline before the terminal sulcus
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Taste budsIn all papillae except for the filiform
Most of them in the vallate papillae
Serous salivary glands – von Ebner, empty into thegroove around the papilla
They wash food particles
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Development of the tongue
Pharynx at the end of the 4th week
1. arch: Median tongue bud
(tuberculum impar)
Distal tongue buds (lateral swellings)
Tuberculum impar
Lateral swellings
Cupola
2. arch: Cupola
Hypopharyngealeminence
3., 4. arch: hypopharyngeal
eminence
The copula is overgrown by the hypopharyngeal eminence and disappears
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Palate (palatum)
hard palate (palatum durum)bony base
plicae palatinae transversae, raphe palati (seam)
soft palate (palatum mole)aponeurosis palatina
uvula palatina (uvula)
muscles: m. tensor veli palatini (n. V3)
m. levator veli palatini
m. uvulae
m. palatoglossus
m. palatopharyngeus
all innervated by (n.X – plexus pharyngeus)
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Isthmus faucium
arcus palatoglossus
arcus palatopharyngeus
sinus tonsillaris
tonsilla palatina– capsula
– fossulae, cryptae
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Pharynx I
1. pars nasalis = nasopharynxfornix
fascia pharyngobasilaris
sinus Morgagni
recessus pharyngeus Luschkae (remnant of notochord)
tonsilla pharyngea Luschkae
tuba auditiva Eustachiitorus tubarius
tonsilla tubaria Gerlachi
recessus pharyngeus Rosenmülleri
pseudostratified columnar with the cilia
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Pharynx II
2. pars oralis („oropharynx“)
valleculae epiglotticae
plica glossoepiglottica mediana + laterales
3. pars laryngea („hypopharynx, laryngopharynx“)
recessus piriformis
aditus laryngis
both stratified sqamous non-keratinizing epithelium
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Pharynxsurrounding spaces
spatium parapharyngeum
spatium prestyloideum
styloid septum
5 muscles + ligament + proc. styloideus
spatium retrostyloideum
spatium retropharyngeum
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Pharynxmuscles
raphe pharyngis, fascia pharyngobasilaris, Luschka´s space
mm. constrictores /3/
m.c. superior – 4 parts – origin at skull /3/ and tongue /1/
m.c. medius – 2 parts – origin at hyoid bone
m.c. inferior – 2 parts – origin at laryngeal cartilages
mm. levatores /3/
m. palatopharygeus (part of soft palate muscles, mounting of the palatopharyngeal arch)
m. salpingopharyngeus
m. stylopharyngeus (!exception! – innervated by n.IX !)
innervation: plexus pharyngeus – n. X
- except m. stylopharyngeus /n. IX /
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Pharynxblood supply
arteries: a. carotis ext.
a. pharyngea ascendens
a. facialis a. palatina ascendens
a. lingualis rr. dorsales linguae
a. maxillaris a. palatina major, a. canalis pterygoidei, r. pharyngeus
veins: plexus (venosus) pharyngeus v. facialis v. jugularis
int.
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PharynxLymph and Nerves
lymph
n.l. retropharyngei
n.l. paratracheales n.l. cervicales profundi
nerves
form plexus pharyngeus
motor n.X (plexus pharyngeus), n.IX (m. stylopharyngeus)
sensory n.X + n.IX (plexus pharyngeus), n.V2 (n. pharyngeus for nasopharynx)
autonomic n.X (plexus pharyngeus) = parasympathetic, rr. laryngopharyngei = sympathetic
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Anulus lymphoideus pharyngis(Waldeyer lymphatic ring)
„ring“ of the lymphatic tissue
first protective barrier of an organism
tonsilla pharyngea (Luschkae)
tonsillae tubariae (Gerlachi)
tonsillae palatinae
tonsilla lingualis
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Sites with weakened walltrigonum Killiani
cranially: m. thyropharyngeus (m. constrictor ph. inf.)
caudally: m. cricopharyngeus (m. constrictor ph. inf.)
diverticulum of Zenker (= pharyngo-oesophageal diverticle; dehiscence of Killian)
trigonum Laimeri
cranially: m. cricopharyngeus
caudally: upper oblique fibres of longitudinal muscle layer of oesophagues
area Killian-Jamiesonat lateral side of oesophagus
diverticulum of Killian-Jamieson
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